Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16d64cc17dcbb02…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 16:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b15decbb6843065a0ac76946a048ccc0 SHA-1: f56520ad93f5ab6319b585e8b1629f0d54c4fed8 SHA-256: e16d64cc17dcbb0235c5c9c63e5fbff9a28126c13be7159de0c592fd9e6f2765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links strongly implies an attempt to lead users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://salvatoredivilio.it/userfiles/file/67144102722.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ed7aa308---16592126062.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/43409582391.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160849b18905ba---51594441002.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zewokonup.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210716_E0BEE44ADD8248A4.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/4054558363.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/pitesejedesa.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/18419699391.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/21201220971.pdfIn PDF document text
    • http://apcmagon.com/userfiles/fogerulativum.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0jlaqkj06k2enh5nao5emlvvh9/66883456429.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qo5djr4acfpchbuqr7tv4nhim0/58722671480.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/rokomonajezedilizaganu.pdfIn PDF document text
    • http://lukinserv.hu/file/89782183102.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/tefojozovoxixaxo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/57032623981.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rqieji60bukdcfuh3g1v46hiic/95825584263.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/pukejenuzelifoza.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107d04ac395a---kirunowunepoketuruz.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/wikuxakizonijijazo.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/a293rr3b9kl0g30du03bbrv26p/67123079435.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/28686667880.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/eacc74d6d07966046c07e0d8ea8739e9/gokexaxamaj.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/91970545055.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117831c9ee---54641403180.pdfIn PDF document text
    • https://wsbtitan.com/images/file/44937723936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+dpt+2019+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16816 bytes
SHA-256: 0aa25225cd8797533cdd37a11a8dfad3db87de88eee0443ab48601448e46ce82
font_02_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 10548 bytes
SHA-256: 14652fb02ebc6268ce97ed608e8b69995505d7259c360b5b96e69894c3c3826c

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